import importlib
from copy import deepcopy
from os import path as osp

from lbasicsr.utils import get_root_logger, scandir
from lbasicsr.utils.registry import MODEL_REGISTRY

__all__ = ["build_model"]

# automatically scan and import model modules for registry
# scan all the files under the 'models' folder and collect files ending with '_model.py'
model_folder = osp.dirname(osp.abspath(__file__))
model_filenames = [
    osp.splitext(osp.basename(v))[0] for v in scandir(model_folder) if v.endswith("_model.py")
]
# import all the model modules
_model_modules = [
    importlib.import_module(f"lbasicsr.models.{file_name}") for file_name in model_filenames
]


def build_model(opt):
    """Build model from options.

    Args:
        opt (dict): Configuration. It must contain:
            model_type (str): Model type.
    """
    opt = deepcopy(opt)
    # ===============================================================
    model = MODEL_REGISTRY.get(opt["model_type"])(opt)
    # ===============================================================
    logger = get_root_logger()
    logger.info(f"Model [{model.__class__.__name__}] is created.")
    return model
